*{
    margin: 0;
    padding: 0;
}
li{
    list-style: none;
}
main{
    margin: 50px auto;
    width: 960px;
    height: 500px;
    h4{
        height: 100px;
        line-height: 100px;
        text-align: center;
    }
    .tabBox{
        margin: 0 auto;
        width: 900px;
        height: 400px;
        border: 1px solid lightsalmon;        
    }
    input{
        width: 80%;
        height: 80%;
        border: 2px solid #000;
    }
}
nav{
    overflow: hidden;
    li{
        position: relative;
        float: left;
        width: 100px;
        height: 50px;
        text-align: center;
        line-height: 50px;
        border-right: 1px solid #ccc;
        .icon-guanbi{
            position: absolute;
            top: -20px;
            right: 0;
            font-size: 12px;
            height: 20px;
            user-select: none;
        }
    }
    .liActive{
        border-bottom: 1px solid red;
    }
    .tabAdd span{
        float: right;
        margin: 10px;
        width: 20px;
        height: 20px;
        line-height: 20px;
        text-align: center;
        border: 1px solid #ccc;
        user-select: none;//用户不可选中
    }
}
.tabContent{
    height: 350px;
    padding: 30px;
    box-sizing: border-box;
    border-top: 1px solid #ccc;
    section{
        display: none;
        width: 100%;
        height: 240px;
    }
    .sectionActive{
        display: block;
    }
}